Nintendo Account holders can now create and customize Mii characters through their internet browser thanks to the new Mii Studio website! The site will allow Mii characters to be customized using the standard array of options available on Nintendo Switch, including facial features, hairstyle and color, accessories, character height, and favorite color.
Unfortunately, as was announced in a statement from Nintendo prior to the game’s closure on May 9, clothing and accessories which were earned through Nintendo’s Miitomo application are not available through this browser-based customization and will no longer appear on registered Mii characters.